Hi all, I Wish everyone a merry christmas and a happy new year!
I have a 93 xj with a 4.0 with a 116,000 miles on it and runs great good oil pressure, no oil leaks and the engine burns about a quart of oil between changes and has had regular oil changes every 3-4k and engine is clean. My Question is after it warms up a bit there is a rattle or knock coming from the bottom end and the oil pressure stays above 40 psi at above 1500 rpm and about 30 at idle other wise the top end seems quiet and with no passed calif emissions with no problems.I was wondering if I should be concerned or not I don't want to throw a rod on the road some day. I have heard other 4.0 and some seem Quiet and others have this knock without problems. I heard that there maybe some years of 4.0 with a problem with piston slap. Should I be worried or not this is my daily driver and with some minor off roading when going camping. I know some people that got more than 300,000 miles out of these engines!
Any suggestions or comments will be helpful Thanks.